[单选]
Refer to the exhibit. Based on the output of the show spanning-tree command，
which statement is true？（）

A . Switch SW1 has been configured with the spanning-tree vlan 1 root primary global configuration command.
B . Switch SW1 has been configured with the spanning-tree vlan 1 root secondary global configuration command.
C . Switch SW1 has been configured with the spanning-tree vlan 1 priority 24577 global configuration command.
D . Switch SW1 has been configured with the spanning-tree vlan 1 hello-time 2 global configuration command.
E . The root bridge has been configured with the spanning-tree vlan 1 root secondary global configuration command.

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Refer to the exhibit. Based on the output of the show spanning-tree command，
which statement is true？（）

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[单选] Refer to the exhibit. Based on the output of the show spanning-tree command， which statement is true？ （）

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[单选]
Refer to the exhibit. Based on the output of the show spanning-tree command，
which statement is true？（）